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Family name Thrainn (Þráinn , Thrainn
, Thráinn) , all over the world, is an extremely rare cognomen. Predominantly, Thrainn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Þráinn | Iceland |
| Thrainn | Iceland, United States, Canada |
Numason, Bertelsson, Farestveit, and Gunnarsson